First implementation of docs

[aknierim]

• Add a first (simple) implementation of docs for pyvisgen
• This is still WIP, some fixes are necessary for the automodapi summary generation of pyvisgen.layouts and pyvisgen.gridding

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.28%. Comparing base (17b315a) to head (ef8ca8f).
Report is 34 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
- Coverage   88.53%   88.28%   -0.25%     
==========================================
  Files          13       19       +6     
  Lines        1151     1238      +87     
==========================================
+ Hits         1019     1093      +74     
- Misses        132      145      +13     

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[aknierim]

To build the docs, run

$ make -C docs/  html

from the root directory. Once built, you can check out the html pages locally by running

$ python -m http.server docs/_build/html

and open the docs on the served address.